<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<head>
  <!-- <style type="text/css">
  .container{
    margin-top: 50px;
    text-align: center;
  }
   :root {
    --heart-color:pink;
  }
  .heart{
    display: inline-block;
    position: relative;
    width: 60px;
    height: 60px;
    background-color: var(--heart-color,red);
    transform: rotate(-45deg)
  }
  .heart::before,
  .heart::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: var(--heart-color,red);;
  }
  .heart::before{
    top: -50%;
    left: 0;
  }
  </style>
</head>
<body>
  <div class="container">
    <i class="heart"></i>
  </div> -->
  <script>
    function fn(a) {
     

     console.log(a); 
     

     var a = 2;
     

     function a() {};
     

     console.log(a);

 }

fn(2);
  </script>
</body>
</html>
</body>
</html>